Let me start this review by saying I'm actually wearing them right now. I'm absolutely crazy about these leggings! Yesterday I wore them to hike Mabbit Springs beneath a pair of Prana pants and I was very warm, even in the cold, damp, air. Today I wore them to work as leggings beneath a tunic and I've been very comfortable all day. A wonderful thing about SmartWool is that the merino wool used in all of their products is naturally antimicrobial, meaning you don't have to wash it as often. Let me tell you, that's quite handy when you're a college student working 20+ hours a week! Overall, I love these leggings and I definitely recommend them to anyone that wants great bottoms for cool conditions!